33079b2197
This patch changes the way we complete commands. In the old method when we got a completion we searched our command list from the top until we find it. This method uses a tag associated with each command (not SCSI command tagging) to index us directly to the completed command. This helps performance. Signed-off-by: Don Brace <dab@hp.com> Signed-off-by: Mike Miller <mike.miller@hp.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
275 lines
6.4 KiB
C
275 lines
6.4 KiB
C
#ifndef CCISS_H
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#define CCISS_H
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#include <linux/genhd.h>
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#include "cciss_cmd.h"
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#define NWD 16
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#define NWD_SHIFT 4
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#define MAX_PART (1 << NWD_SHIFT)
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#define IO_OK 0
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#define IO_ERROR 1
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#define MAJOR_NR COMPAQ_CISS_MAJOR
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struct ctlr_info;
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typedef struct ctlr_info ctlr_info_t;
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struct access_method {
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void (*submit_command)(ctlr_info_t *h, CommandList_struct *c);
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void (*set_intr_mask)(ctlr_info_t *h, unsigned long val);
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unsigned long (*fifo_full)(ctlr_info_t *h);
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unsigned long (*intr_pending)(ctlr_info_t *h);
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unsigned long (*command_completed)(ctlr_info_t *h);
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};
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typedef struct _drive_info_struct
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{
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__u32 LunID;
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int usage_count;
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struct request_queue *queue;
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sector_t nr_blocks;
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int block_size;
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int heads;
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int sectors;
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int cylinders;
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int raid_level; /* set to -1 to indicate that
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* the drive is not in use/configured
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*/
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int busy_configuring; /*This is set when the drive is being removed
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*to prevent it from being opened or it's queue
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*from being started.
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*/
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} drive_info_struct;
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struct ctlr_info
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{
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int ctlr;
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char devname[8];
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char *product_name;
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char firm_ver[4]; // Firmware version
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struct pci_dev *pdev;
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__u32 board_id;
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void __iomem *vaddr;
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unsigned long paddr;
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unsigned long io_mem_addr;
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unsigned long io_mem_length;
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CfgTable_struct __iomem *cfgtable;
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unsigned int intr;
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int interrupts_enabled;
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int major;
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int max_commands;
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int commands_outstanding;
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int max_outstanding; /* Debug */
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int num_luns;
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int highest_lun;
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int usage_count; /* number of opens all all minor devices */
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// information about each logical volume
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drive_info_struct drv[CISS_MAX_LUN];
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struct access_method access;
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/* queue and queue Info */
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CommandList_struct *reqQ;
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CommandList_struct *cmpQ;
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unsigned int Qdepth;
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unsigned int maxQsinceinit;
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unsigned int maxSG;
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spinlock_t lock;
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//* pointers to command and error info pool */
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CommandList_struct *cmd_pool;
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dma_addr_t cmd_pool_dhandle;
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ErrorInfo_struct *errinfo_pool;
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dma_addr_t errinfo_pool_dhandle;
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unsigned long *cmd_pool_bits;
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int nr_allocs;
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int nr_frees;
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int busy_configuring;
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int busy_initializing;
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/* This element holds the zero based queue number of the last
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* queue to be started. It is used for fairness.
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*/
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int next_to_run;
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// Disk structures we need to pass back
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struct gendisk *gendisk[NWD];
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#ifdef CONFIG_CISS_SCSI_TAPE
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void *scsi_ctlr; /* ptr to structure containing scsi related stuff */
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#endif
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unsigned char alive;
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};
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/* Defining the diffent access_menthods */
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/*
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* Memory mapped FIFO interface (SMART 53xx cards)
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*/
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#define SA5_DOORBELL 0x20
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#define SA5_REQUEST_PORT_OFFSET 0x40
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#define SA5_REPLY_INTR_MASK_OFFSET 0x34
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#define SA5_REPLY_PORT_OFFSET 0x44
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#define SA5_INTR_STATUS 0x30
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#define SA5_SCRATCHPAD_OFFSET 0xB0
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#define SA5_CTCFG_OFFSET 0xB4
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#define SA5_CTMEM_OFFSET 0xB8
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#define SA5_INTR_OFF 0x08
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#define SA5B_INTR_OFF 0x04
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#define SA5_INTR_PENDING 0x08
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#define SA5B_INTR_PENDING 0x04
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#define FIFO_EMPTY 0xffffffff
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#define CCISS_FIRMWARE_READY 0xffff0000 /* value in scratchpad register */
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#define CISS_ERROR_BIT 0x02
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#define CCISS_INTR_ON 1
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#define CCISS_INTR_OFF 0
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/*
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Send the command to the hardware
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*/
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static void SA5_submit_command( ctlr_info_t *h, CommandList_struct *c)
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{
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#ifdef CCISS_DEBUG
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printk("Sending %x - down to controller\n", c->busaddr );
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#endif /* CCISS_DEBUG */
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writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
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h->commands_outstanding++;
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if ( h->commands_outstanding > h->max_outstanding)
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h->max_outstanding = h->commands_outstanding;
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}
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/*
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* This card is the opposite of the other cards.
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* 0 turns interrupts on...
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* 0x08 turns them off...
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*/
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static void SA5_intr_mask(ctlr_info_t *h, unsigned long val)
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{
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if (val)
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{ /* Turn interrupts on */
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h->interrupts_enabled = 1;
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writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
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} else /* Turn them off */
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{
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h->interrupts_enabled = 0;
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writel( SA5_INTR_OFF,
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h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
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}
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}
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/*
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* This card is the opposite of the other cards.
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* 0 turns interrupts on...
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* 0x04 turns them off...
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*/
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static void SA5B_intr_mask(ctlr_info_t *h, unsigned long val)
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{
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if (val)
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{ /* Turn interrupts on */
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h->interrupts_enabled = 1;
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writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
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} else /* Turn them off */
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{
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h->interrupts_enabled = 0;
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writel( SA5B_INTR_OFF,
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h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
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}
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}
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/*
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* Returns true if fifo is full.
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*
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*/
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static unsigned long SA5_fifo_full(ctlr_info_t *h)
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{
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if( h->commands_outstanding >= h->max_commands)
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return(1);
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else
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return(0);
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}
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/*
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* returns value read from hardware.
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* returns FIFO_EMPTY if there is nothing to read
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*/
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static unsigned long SA5_completed(ctlr_info_t *h)
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{
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unsigned long register_value
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= readl(h->vaddr + SA5_REPLY_PORT_OFFSET);
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if(register_value != FIFO_EMPTY)
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{
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h->commands_outstanding--;
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#ifdef CCISS_DEBUG
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printk("cciss: Read %lx back from board\n", register_value);
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#endif /* CCISS_DEBUG */
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}
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#ifdef CCISS_DEBUG
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else
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{
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printk("cciss: FIFO Empty read\n");
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}
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#endif
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return ( register_value);
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}
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/*
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* Returns true if an interrupt is pending..
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*/
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static unsigned long SA5_intr_pending(ctlr_info_t *h)
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{
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unsigned long register_value =
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readl(h->vaddr + SA5_INTR_STATUS);
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#ifdef CCISS_DEBUG
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printk("cciss: intr_pending %lx\n", register_value);
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#endif /* CCISS_DEBUG */
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if( register_value & SA5_INTR_PENDING)
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return 1;
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return 0 ;
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}
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/*
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* Returns true if an interrupt is pending..
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*/
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static unsigned long SA5B_intr_pending(ctlr_info_t *h)
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{
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unsigned long register_value =
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readl(h->vaddr + SA5_INTR_STATUS);
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#ifdef CCISS_DEBUG
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printk("cciss: intr_pending %lx\n", register_value);
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#endif /* CCISS_DEBUG */
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if( register_value & SA5B_INTR_PENDING)
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return 1;
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return 0 ;
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}
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static struct access_method SA5_access = {
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SA5_submit_command,
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SA5_intr_mask,
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SA5_fifo_full,
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SA5_intr_pending,
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SA5_completed,
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};
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static struct access_method SA5B_access = {
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SA5_submit_command,
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SA5B_intr_mask,
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SA5_fifo_full,
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SA5B_intr_pending,
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SA5_completed,
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};
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struct board_type {
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__u32 board_id;
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char *product_name;
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struct access_method *access;
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};
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#define CCISS_LOCK(i) (&hba[i]->lock)
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#endif /* CCISS_H */
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